Tefal RG9495 Replacement Battery 14.8V 5200mAh Li-ion

Tefal RG9495 — 14.8V Li-ion Replacement Battery (N139-4S2P)

This is a 14.8V 5200mAh Li-ion battery for the Tefal RG9495 cordless vacuum cleaner. It replaces OEM part numbers N139-4S2P and SS-2230003459. Capacity, voltage, and connector match the original specification.

• RG9495 compatibility: The RG9495 runs a 14.8V four-cell Li-ion pack with a BMS that monitors cell voltage balance and current draw during motor operation. This pack matches that voltage rail, cell configuration, and connector pinout exactly.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the RG9495 platform. The BMS communicated correctly with the charger, accepted a full charge without fault codes, and cut off cleanly at the low-voltage threshold under motor load.
• Dock charging habit for the RG9495: The RG9495 charging dock does not interrupt current when the pack reaches full charge on older firmware. Leaving the vacuum docked permanently accelerates capacity fade — charge to full, then remove it from the dock.

Suction dropping before the battery indicator reaches low on the RG9495

The RG9495 motor draws current spikes above rated amperage when suction is restricted — typically a clogged filter or partial blockage in the duct. A degraded battery pack cannot sustain the voltage under those spikes, so the BMS pulls back power to protect the cells. The result is reduced suction that looks like a dying battery but is actually a voltage sag event. Clean the filter first, then check whether suction recovers — if it does, the battery is not the root cause. If the filter is clean and voltage still sags, the original pack has lost enough cell capacity to warrant replacement.

Motor cuts out mid-clean then recovers after a few seconds

This is a BMS overcurrent trip, not a power failure. When airflow is restricted — blocked filter, full dust cup, or sealed nozzle — the motor strains against the resistance and draws current beyond the BMS threshold. The BMS cuts the circuit to protect the cells, then resets once current normalises. Check the filter and empty the dust cup before assuming the battery is faulty. If the cutout still occurs with clear airflow and a clean filter, measure pack voltage at rest — a healthy 14.8V nominal pack should read above 15.5V fully charged.